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Apr 07, 2026 - 12:52 PM
FAS-DPD is a titrimetric method used to measure chlorine residuals in water. It involves adding ferrous ammonium sulfate (FAS) to reduce the pink DPD (N,N-diethyl-p-phenylenediamine) color back to colorless, with the amount of FAS titrant used indicating the chlorine concentration. Therefore, yes, FAS-DPD is a titrimetric method.
